new install with 500 error

RewriteEngine on
#may need uncommenting
Options -FollowSymLinks +SymLinksIfOwnerMatch
RewriteCond %{QUERY_STRING} mosConfig_[a-zA-Z_]{1,21}(=|\%3D) [OR]
RewriteCond %{QUERY_STRING} base64_encode.*\(.*\) [OR]
RewriteCond %{QUERY_STRING} (\<|%3C).*script.*(\>|%3E) [NC,OR]
RewriteCond %{QUERY_STRING} GLOBALS(=|\[|\%[0-9A-Z]{0,2}) [OR]
RewriteCond %{QUERY_STRING} _REQUEST(=|\[|\%[0-9A-Z]{0,2})
RewriteRule ^(.*)$ index.php [F,L]
# RewriteBase /15
RewriteCond %{REQUEST_URI} ^(/component/option,com) [NC,OR]
RewriteCond %{REQUEST_URI} (/|\.htm|\.php|\.html|/[^.]*)$  [NC]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule (.*) index.php
<FilesMatch "^\.ht">
    Order allow,deny
    Deny from all
    Satisfy All
</FilesMatch>
Options -Indexes
RewriteCond %{HTTP_HOST} ^(www.)?domain.com$
RewriteCond %{REQUEST_URI} !^/joomla/
RewriteRule ^(.*)$ /joomla/$1
RewriteCond %{HTTP_HOST} ^(www.)?domain.com$
RewriteRule ^(/)?$ joomla/index.php [L] 
<IfModule mod_expires.c>
# ExpiresActive On
# ExpiresByType application/x-javascript A604800
# ExpiresDefault A600
# ExpiresByType image/x-icon A2592000
# ExpiresByType text/css A604800
# ExpiresByType image/gif A2592000
# ExpiresByType image/png A2592000
# ExpiresByType image/jpeg A2592000
# ExpiresByType text/plain A86400
# ExpiresByType application/x-shockwave-flash A2592000
# ExpiresByType video/x-flv A2592000
# ExpiresByType application/pdf A2592000
# ExpiresByType text/html A600
</IfModule>